日立正在开发应用在移动电话上的被动式触摸屏技术，该技术不同于传统的传感器触摸屏技术，能够使触摸屏更加可靠。
传统触摸屏技术在屏幕四周安置很薄的薄膜晶体管，然后通过这些薄膜晶体管来检测当手指点击触摸屏时所带来的参数改变，然后通过算法来决定手指点击了哪里。
日立公司的欧洲销售经理Matt Tapping说：“我们想开发一种没有机械装置的触摸屏传感器”。
日立公司显示部门已经开发了一个原型系统，并计划在明年开始进行量产。
这种触摸屏技术成本更低，而且比电阻触摸屏或者电容触摸屏更稳定，但是这种触摸屏不能提供一些新的技术比如使用在苹果iPhone上的"pinching"技术。这种触摸屏将只能当成软按键来使用。
Hitachi gets passive aggressive with touch screen reliability
Hitachi is developing a passive technique for touch sensing on mobile phones that does not involve the traditional sensor technology and could make touch screens more reliable.
Instead it uses ordinary thin film transistors (TFTs) around the edge of the screen that can detect a change in light when a finger touches the screen. Algorithms are then used to sense where the finger is.
"We want to develop a touch sensor without any mechanical components," said Matt Tapping, sales manager at Hitachi Europe.
Hitachi Displays has developed a prototype system and is planning production for the end of next year.
This is a much lower cost, more reliable approach than resistive or capacitative sensing, but would not be able to handle the newer techniques such as 'pinching' used on the Apple iPhone. "This would have to be used for soft keys," he said.
